Fri group 2 carbon Fiber Composites

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Transcript of Fri group 2 carbon Fiber Composites

Comparing the Effects of Weave Type and Epoxy on Carbon Fiber Composite Tensile and Bend StrengthObjectiveTo make carbon fiber/epoxy composites out of different carbon types of fiber weaves and epoxiesTo test the bend and tensile strengths of the different compositesCompare the effects of two different epoxies ( general, reinforced with Kevlar and graphite)Compare the effects of two different fiber weaves (tight, loose)Background Information: Carbon FiberProcedureMaterials & EquipmentResults and DiscussionTensile TestTight weave with general epoxy strongestLoose weave with Kevlar epoxy weakestBend TestLoose weave was weakest for both general and Kevlar epoxiesDidn't offer enough resistance to get good readingsTight weave with Kevlar epoxy was strongest

Fabric and epoxy, dispersed phase and matrix phase24 April 2015University of the Pacific

Cut 4 "I" shaped and 4 rectangular samples for each type of weaveCoated one of each shape in the general epoxy and the remaining shapes in the Kevlar epoxyAllowed 1 week for curing"I" shaped samples were then placed in the MTS for tensile testRectangular samples were then placed in the MTS for bend testOne of the lightest and strongest material in existenceGraphite polymer arranged in hexagonal rings An epoxy is used to form a composite and add strength by distributing load throughout entire fabricDifferent types of epoxies provide different physical characteristicsThe composite is very brittle, but strong. Light with high elastic modulus, tensile strength, and yield strengthWeave type has almost no effect on strength, mostly effects flexibility and aestheticsBackground InformationBend tests help determine ductility of the specimenTo determine tensile strength, tensile test can be done on the compositeA stress-strain curve can be createdPhysical HazardsGogglesBlast Shield PrecautionsCutsFlying shardsSharp MetalsSafety AnalysisTensile Test ResultsChemical HazardsGlovesMask for fumesEpoxy fume hoodPrecautionsBurnsRespiratory HarmSafety AnalysisBend Test ResultsTAP Plastics- www.tapplastics.comCarbon fiber background -http://www.solarcomposites.com/fabricchoice.htmlNike Superfly picture - https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcRlhj5lVqniq-YmkjjxJx3Vpm6q2yQG3d2jN4j_NAiXzlx72GbQSQBadminton racquet - http://fleet.webi.my/files/2011/04/fleet_grand_woven_1000_ii_002.jpgLamborghini picture - https://encrypted-tbn0.gstatic.com/imagesq=tbn:ANd9GcRHStnFIVk17IJ5vDSQOZhU0BCCSxZ-62JndE6QmHyTqtP3x5ZcACarbon fiber picture - http://harrisonsteele.com/wp-content/uploads/2012/03/carbon-fiber-8.jpgCarbon fiber background - http://www.masterbond.com/techtips/what-epoxy-adhesiveCarbon fiber background -http://www.wisegeek.org/what-is-carbon-fiber.htmBend Test Background- http://www.welding-advisers.com/Bend-testing.html

Background informationv = Deflection, used to calculate elastic modulusP = Applied loadL = Distance between support rollers (span)Objective: to determine the strongest carbon fiber/epoxy matrix by testing tight and loose weave carbon fiber samples with two different epoxies: one reinforced with Kevlar and graphite, and a general epoxy.

Objectives were met through:Tensile and bend tests of different epoxiesComposites with general epoxy as dispersed phase had greater tensile strength Composites with tight weave as matrix phase had greater bend strength

These two tests helped us understand the effects of property averaging due to composite characteristics. This information can be used to design projects which require properties found in this experiment, including high elastic modulus and strength. = Bending stressM = Bending moment I = Moment of inertia y = Distance from neutral axisM = Bending momentP = Applied loadL = Span =Tensile stressF= Force appliedA= Cross-sectional area of the material =Tensile straindL= Change in length of the sampleLo= The initial sample lengthFrom left to right: Tight weave + general epoxy; Loose weave + general epoxy; Tight weave + Kevlar&graphite epoxy; Loose weave + Kevlar&graphite epoxyLoose weave was not very resistant to bending, spread of data can be described as being in the noise. Tight weave in general epoxy had the greatest tensile strengthNike Mercurial Superfly soccer cleats Fleet Racket Woven 1000 II(Badminton)2014 Lamborghini VenenoCarbon fiber sample from Harrison Steel (co)